chemistry

Hypothiocyanite

Hypothiocyanite is a chemistry topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Hypothiocyanite rather than just read about it. In short: Hypothiocyanite is the anion [OSCN]− and the conjugate base of hypothiocyanous acid (HOSCN). It is an organic compound part of the thiocyanates as it contains the functional group SCN.

Key takeaways

Hypothiocyanite belongs to chemistry; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Hypothiocyanite to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Hypothiocyanite from memory before moving on to harder problems.

Reference excerpt

Hypothiocyanite is the anion [OSCN]− and the conjugate base of hypothiocyanous acid (HOSCN). It is an organic compound part of the thiocyanates as it contains the functional group SCN. It is formed when an oxygen is singly bonded to the thiocyanate group. Hypothiocyanous acid is a fairly weak acid; its acid dissociation constant (pKa) is 5.3. Hypothiocyanite is formed by peroxidase catalysis of hydrogen peroxide and thiocyanate:

H2O2 + SCN− → OSCN− + H2O

As a bactericide Hypothiocyanite occurs naturally in the antimicrobial immune system of the human respiratory tract in a redox reaction catalyzed by the enzyme lactoperoxidase. It has been researched extensively for its capabilities as an alternative antibiotic as it is harmless to human body cells while being cytotoxic to bacteria. The exact processes for making hypothiocyanite have been patented as such an effective antimicrobial has many commercial applications.

Mechanism of action Lactoperoxidase-catalysed reactions yield short-lived intermediary oxidation products of SCN−, providing antibacterial activity. The major intermediary oxidation product is hypothiocyanite OSCN−, which is produced in an amount of about 1 mole per mole of hydrogen peroxide. At the pH optimum of 5.3, the OSCN− is in equilibrium with HOSCN. The uncharged HOSCN is considered to be the greater bactericidal of the two forms. At pH 7, it was evaluated that HOSCN represents 2% compare to OSCN− 98%. The action of OSCN− against bacteria is reported to be caused by sulfhydryl (SH) oxidation. The oxidation of -SH groups in the bacterial cytoplasmic membrane results in loss of the ability to transport glucose and also in leaking of potassium ions, amino acids and peptide. OSCN− has also been identified as an antimicrobial agent in milk, saliva, tears, and mucus. OSCN− is considered as a safe product as it is not mutagenic.

Relation to cystic fibrosis Initially, this particular lactoperoxidase-catalyzed compound was originally discovered while viewing the specific environment of cystic fibrosis patients' weakened respiratory immune system against bacterial infection. Symptoms of cystic fibrosis include an inability to secrete sufficient quantities of SCN− which results in a shortage of necessary hypothiocyanite, resulting in increasing mucous viscosity, inflammation and bacterial infection in the respiratory tract. Lactoferrin with hypothiocyanite has been granted orphan drug status by the EMEA and the FDA. Naturally, the discovery correlated with studies exploring different methods seeking to further gain alternative antibiotics, understanding that most older antibiotics are decreasing in effectiveness against bacteria with antibiotic resistance. OSCN−, which is not an antibiotic, has proved efficacy on superbugs including MRSA reference strains, BCC, Mucoid PA Schema of LPO/SCN−/H2O2 in human lung:

Efficacy range Non exhaustive list of microorganisms. Bacteria (Gram-positive and -negative)

Viruses

Yeasts and moulds

See also Respiratory tract antimicrobial defense system

References

Worked examples

Example 1 — a first encounter with Hypothiocyanite

Start with the simplest possible case. Write down what Hypothiocyanite claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In chemistry, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Hypothiocyanite before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Hypothiocyanite ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Hypothiocyanite

In research: Hypothiocyanite appears in chemistry research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Hypothiocyanite in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Hypothiocyanite is common in secondary-school and first-year university syllabi. It links to neighbouring topics Anions, Clinical chemistry, Sulfur ions, so understanding it makes those chapters shorter.
In everyday life: Look for Hypothiocyanite outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Hypothiocyanite in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Hypothiocyanite means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Hypothiocyanite out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Hypothiocyanite in simple terms?

Hypothiocyanite is the anion [OSCN]− and the conjugate base of hypothiocyanous acid (HOSCN). It is an organic compound part of the thiocyanates as it contains the functional group SCN.

Why does Hypothiocyanite matter?

Because it connects several chemistry ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Hypothiocyanite?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Hypothiocyanite.